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Ignore zfs_arc_shrinker_limit in direct reclaim mode #16313

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Aug 21, 2024
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Ignore zfs_arc_shrinker_limit in direct reclaim mode #16313

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1 change: 1 addition & 0 deletions man/man4/zfs.4
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Original file line number Diff line number Diff line change
Expand Up @@ -821,6 +821,7 @@ This is a limit on how many pages the ARC shrinker makes available for
eviction in response to one page allocation attempt.
Note that in practice, the kernel's shrinker can ask us to evict
up to about four times this for one allocation attempt.
To reduce OOM risk, this limit is applied for kswapd reclaims only.
.Pp
The default limit of
.Sy 10000 Pq in practice, Em 160 MiB No per allocation attempt with 4 KiB pages
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6 changes: 3 additions & 3 deletions module/os/linux/zfs/arc_os.c
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Expand Up @@ -201,9 +201,9 @@ arc_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
* See also the comment above zfs_arc_shrinker_limit.
*/
int64_t can_free = btop(arc_evictable_memory());
int64_t limit = zfs_arc_shrinker_limit != 0 ?
zfs_arc_shrinker_limit : INT64_MAX;
return (MIN(can_free, limit));
if (current_is_kswapd() && zfs_arc_shrinker_limit)
can_free = MIN(can_free, zfs_arc_shrinker_limit);
return (can_free);
}

static unsigned long
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